152 lines
3.5 KiB
C
152 lines
3.5 KiB
C
/*
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* CDE - Common Desktop Environment
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*
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* Copyright (c) 1993-2012, The Open Group. All rights reserved.
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*
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* These libraries and programs are free software; you can
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* redistribute them and/or modify them under the terms of the GNU
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* Lesser General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* These libraries and programs are distributed in the hope that
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* they will be useful, but WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU Lesser General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with these libraries and programs; if not, write
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* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
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* Floor, Boston, MA 02110-1301 USA
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*/
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/*%% (c) Copyright 1993, 1994 Hewlett-Packard Company */
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/*%% (c) Copyright 1993, 1994 International Business Machines Corp. */
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/*%% (c) Copyright 1993, 1994 Sun Microsystems, Inc. */
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/*%% (c) Copyright 1993, 1994 Novell, Inc. */
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/*%% $XConsortium: isamdelrec.c /main/3 1995/10/23 11:34:30 rswiston $ */
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/*
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* Copyright (c) 1988 by Sun Microsystems, Inc.
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*/
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/*
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* isamdelrec.c
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*
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* Description: _amdelrec()
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* Delete record from ISAM file.
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*
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*
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*/
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#include "isam_impl.h"
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void _delkeys(Fcb *fcb, char *record, Recno recnum);
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/*
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* _amdelrec(isfhandle, recnum, errcode)
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*
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* _amdelrec() deletes a record from ISAM file.
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*
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* Input params:
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* isfhandle Handle of ISAM file
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* recnum record number of the record to be deleted
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*
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* Output params:
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* errcode error status of the operation
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*
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*/
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int
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_amdelrec(Bytearray *isfhandle, Recno recnum, struct errcode *errcode)
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{
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Fcb *fcb = NULL;
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char recbuf[ISMAXRECLEN];
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int reclen;
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int (*rec_read)(Fcb *, char *, Recno, int *);
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int (*rec_delete)(Fcb *, Recno);
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_isam_entryhook();
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/*
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* Get FCB corresponding to the isfhandle handle.
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*/
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if ((fcb = _openfcb(isfhandle, errcode)) == NULL) {
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_isam_exithook();
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return (ISERROR);
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}
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rec_read = (fcb->varflag?_vlrec_read:_flrec_read);
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rec_delete = (fcb->varflag?_vlrec_delete:_flrec_delete);
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/*
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* Update information in FCB from CNTL page on the disk
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*/
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(void)_isfcb_cntlpg_r2(fcb);
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/*
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* We must read the record first to be able to delete keys.
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*/
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if (rec_read(fcb, recbuf, recnum, &reclen) != ISOK) {
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_amseterrcode(errcode, ENOREC);
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goto ERROR;
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}
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if (rec_delete(fcb, recnum) != ISOK) {
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_amseterrcode(errcode, ENOREC);
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goto ERROR;
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}
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fcb->nrecords--;
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/*
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* Delete associated entries from all indexes.
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*/
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_delkeys(fcb, recbuf, recnum);
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_amseterrcode(errcode, ISOK);
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_issignals_mask();
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_isdisk_commit();
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_isdisk_sync();
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_isdisk_inval();
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/*
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* Update CNTL Page from the FCB.
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*/
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(void)_isfcb_cntlpg_w2(fcb);
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_issignals_unmask();
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_isam_exithook();
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return (ISOK);
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ERROR:
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_isdisk_rollback();
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_isdisk_inval();
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/*
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* Restore FCB from CNTL page.
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*/
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if (fcb) (void)_isfcb_cntlpg_r2(fcb);
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_isam_exithook();
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return (ISERROR);
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}
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/*
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* _isdelkeys()
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*
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* Delete key entry from all indexes.
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*/
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void
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_delkeys(Fcb *fcb, char *record, Recno recnum)
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{
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int nkeys = fcb->nkeys;
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int i;
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for (i = 0; i < nkeys; i++) {
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_del1key(fcb, fcb->keys + i, record, recnum);
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}
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}
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